Role of particle gradation of clay-sand mixture on interfacial adhesion performance of polymer coating
Résumé
Interface performance between clay-sand mixtures and concrete structures are governed by
the mixture composition and its physical properties. Moisture content and particle size
distribution play a governing role in deciding the mixture fabric, its porosity, hydraulic
conductivity, and its behaviour under various mechanical loading. Application of a polymer
interfacial coating can improve the bond performance between soils and concrete mainly by
interfacial friction/mechanical interlocking. The present work analyse the interfacial strength
development between clay-sand mixtures and a polymer coating with changes in the particle
gradation. The multi-scale mechanisms at the interface are investigated giving primary
attention to soil porosity. A mixture of 50C:50S exhibited highest interfacial adhesive
performance compared to other soil mixes. Also, moisture controlled pores and gradation
controlled pores revealed difference in macroscale interfacial strength. Both Mercury
Intrusion Porosimetry (MIP) and $^{129}$Xe Nuclear Magnetic Resonance (NMR) were utilized to
detect the pore structure of the mixtures. $^{129}$Xe NMR revealed the pore distribution of the
mixture ranging from macropores to nanopores and MIP complemented the pore information
by determining the critical pore entry diameter in the macropore regime. Mesopores
dominated on increasing the fine sand content until a threshold value, thereafter merging of
pores occurred and macropores dominated.
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